Hi Tony thanks for the link. I had read that article but not the 3D print part.
I was really aiming at getting some use out of old motors which I collect. I think if I was specifically looking for this kind of drive I know there are some available.
Apart from a recently bought kit, I scratchbuild and use all those pieces of wood and fittings i have in the workshop, well shed really. I find it very satisfactory to build a model boat and only spend on glue and paint and even better when the plan is free as well.
I know that when that bucket is presented to me for kicking the bits and pieces I value will just be disposed of.
So getting some use out of old or obsolete stuff is the essence for me. If no one has a Bongo then the boat will not be built.
At the moment I am building from the otherwise unwanted wood a working model which might be more valued by my kith and kin.
Thanks for your reply and regards
Roy